Count months between two timestamp on postgresql?

Question

I want to count the number of months between two dates.

Doing :

SELECT TIMESTAMP \'2012-06-13 10:38:40\' - TIMESTAMP \'2011-04-30 14:38:40\';
         


        

Answer 1

I had the same problem once upon a time and wrote this ... it's quite ugly:

postgres=>  SELECT floor((extract(EPOCH FROM TIMESTAMP '2012-06-13 10:38:40' ) - extract(EPOCH FROM TIMESTAMP '2005-04-30 14:38:40' ))/30.43/24/3600);
 floor 
-------
    85
(1 row)

In this solution "one month" is defined to be 30.43 days long, so it may give some unexpected results over shorter timespans.